@article{MAN_1986__276_164184,
     author = {D.N. Kupeli},
     title = {On {Existence} and {Comparison} of {Conjugate} {Points} in {Riemannian} and {Lorentzian} {Geometry.}},
     journal = {Mathematische Annalen},
     pages = {67--80},
     publisher = {mathdoc},
     volume = {276},
     year = {1986},
     zbl = {0585.53037},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__276_164184/}
}